Color-Fading Spectrophotometric Determination of Cerium with DBC-Arsenazo  

作　　者：翟庆洲 张晓霞 

机构地区：[1]Research Center for Nanotechnology, West Campus, Changchun University of Science and Technology, Changchun 130022, China

出　　处：《Journal of Rare Earths》2004年第3期440-442,共3页稀土学报（英文版）

基　　金：ProjectsupportedbytheScientificResearchFoundationfortheReturnedOverseasChineseScholars ;ChangchunUniversityofScienceandTechnology ( 4 0 10 3 / 12 915 9)

摘　　要：In the medium of 0.18～1.08 mol·L^(-1) sulfuric acid, cerium(Ⅳ) has the color-fading effect on DBC-arsenazo. The apparent molar absorptivity of the color-fading reaction is ε _(530 nm)=1.03×10~4 L·mol^(-1)·cm^(-1). Beer′s law is obeyed over the range of 1.20～12.0 μg·ml^(-1) of Ce (Ⅳ) which shows a linear relationship with the decrease in the absorbance of the colored solution. The effect of thirty-six coexisting ions was studied. The method was applied to the determination of the trace amount of cerium in water samples and has the advantage of high accuracy and good selectivity.In the medium of 0.18～1.08 mol·L^(-1) sulfuric acid, cerium(Ⅳ) has the color-fading effect on DBC-arsenazo. The apparent molar absorptivity of the color-fading reaction is ε _(530 nm)=1.03×10~4 L·mol^(-1)·cm^(-1). Beer′s law is obeyed over the range of 1.20～12.0 μg·ml^(-1) of Ce (Ⅳ) which shows a linear relationship with the decrease in the absorbance of the colored solution. The effect of thirty-six coexisting ions was studied. The method was applied to the determination of the trace amount of cerium in water samples and has the advantage of high accuracy and good selectivity.

关 键 词：chemical analysis color-fading spectrophotometry cerium (Ⅳ) DBC-arsenazo rare earths 

分 类 号：O657.3[理学—分析化学]